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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT>     * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing,<a name="line.12"></a>
<FONT color="green">013</FONT>     * software distributed under the License is distributed on an<a name="line.13"></a>
<FONT color="green">014</FONT>     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a>
<FONT color="green">015</FONT>     * KIND, either express or implied.  See the License for the<a name="line.15"></a>
<FONT color="green">016</FONT>     * specific language governing permissions and limitations<a name="line.16"></a>
<FONT color="green">017</FONT>     * under the License.<a name="line.17"></a>
<FONT color="green">018</FONT>     */<a name="line.18"></a>
<FONT color="green">019</FONT>    package org.apache.commons.lang.math;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import java.util.Random;<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>    /**<a name="line.23"></a>
<FONT color="green">024</FONT>     * &lt;p&gt;&lt;code&gt;RandomUtils&lt;/code&gt; is a wrapper that supports all possible <a name="line.24"></a>
<FONT color="green">025</FONT>     * {@link java.util.Random} methods via the {@link java.lang.Math#random()}<a name="line.25"></a>
<FONT color="green">026</FONT>     * method and its system-wide &lt;code&gt;Random&lt;/code&gt; object.<a name="line.26"></a>
<FONT color="green">027</FONT>     * <a name="line.27"></a>
<FONT color="green">028</FONT>     * @author Gary D. Gregory<a name="line.28"></a>
<FONT color="green">029</FONT>     * @since 2.0<a name="line.29"></a>
<FONT color="green">030</FONT>     * @version $Id: RandomUtils.java 906320 2010-02-04 01:41:10Z sebb $<a name="line.30"></a>
<FONT color="green">031</FONT>     */<a name="line.31"></a>
<FONT color="green">032</FONT>    public class RandomUtils {<a name="line.32"></a>
<FONT color="green">033</FONT>    <a name="line.33"></a>
<FONT color="green">034</FONT>        /**<a name="line.34"></a>
<FONT color="green">035</FONT>         * An instance of {@link JVMRandom}.<a name="line.35"></a>
<FONT color="green">036</FONT>         */<a name="line.36"></a>
<FONT color="green">037</FONT>        public static final Random JVM_RANDOM = new JVMRandom();<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>    // should be possible for JVM_RANDOM?<a name="line.39"></a>
<FONT color="green">040</FONT>    //    public static void nextBytes(byte[]) {<a name="line.40"></a>
<FONT color="green">041</FONT>    //    public synchronized double nextGaussian();<a name="line.41"></a>
<FONT color="green">042</FONT>    //    }<a name="line.42"></a>
<FONT color="green">043</FONT>    <a name="line.43"></a>
<FONT color="green">044</FONT>        /**<a name="line.44"></a>
<FONT color="green">045</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed int value<a name="line.45"></a>
<FONT color="green">046</FONT>         * from the Math.random() sequence.&lt;/p&gt;<a name="line.46"></a>
<FONT color="green">047</FONT>         * &lt;b&gt;N.B. All values are &gt;= 0.&lt;b&gt;<a name="line.47"></a>
<FONT color="green">048</FONT>         * @return the random int<a name="line.48"></a>
<FONT color="green">049</FONT>         */<a name="line.49"></a>
<FONT color="green">050</FONT>        public static int nextInt() {<a name="line.50"></a>
<FONT color="green">051</FONT>            return nextInt(JVM_RANDOM);<a name="line.51"></a>
<FONT color="green">052</FONT>        }<a name="line.52"></a>
<FONT color="green">053</FONT>        <a name="line.53"></a>
<FONT color="green">054</FONT>        /**<a name="line.54"></a>
<FONT color="green">055</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed int value<a name="line.55"></a>
<FONT color="green">056</FONT>         * from the given &lt;code&gt;random&lt;/code&gt; sequence.&lt;/p&gt;<a name="line.56"></a>
<FONT color="green">057</FONT>         *<a name="line.57"></a>
<FONT color="green">058</FONT>         * @param random the Random sequence generator.<a name="line.58"></a>
<FONT color="green">059</FONT>         * @return the random int<a name="line.59"></a>
<FONT color="green">060</FONT>         */<a name="line.60"></a>
<FONT color="green">061</FONT>        public static int nextInt(Random random) {<a name="line.61"></a>
<FONT color="green">062</FONT>            return random.nextInt();<a name="line.62"></a>
<FONT color="green">063</FONT>        }<a name="line.63"></a>
<FONT color="green">064</FONT>        <a name="line.64"></a>
<FONT color="green">065</FONT>        /**<a name="line.65"></a>
<FONT color="green">066</FONT>         * &lt;p&gt;Returns a pseudorandom, uniformly distributed int value<a name="line.66"></a>
<FONT color="green">067</FONT>         * between &lt;code&gt;0&lt;/code&gt; (inclusive) and the specified value<a name="line.67"></a>
<FONT color="green">068</FONT>         * (exclusive), from the Math.random() sequence.&lt;/p&gt;<a name="line.68"></a>
<FONT color="green">069</FONT>         *<a name="line.69"></a>
<FONT color="green">070</FONT>         * @param n  the specified exclusive max-value<a name="line.70"></a>
<FONT color="green">071</FONT>         * @return the random int<a name="line.71"></a>
<FONT color="green">072</FONT>         */<a name="line.72"></a>
<FONT color="green">073</FONT>        public static int nextInt(int n) {<a name="line.73"></a>
<FONT color="green">074</FONT>            return nextInt(JVM_RANDOM, n);<a name="line.74"></a>
<FONT color="green">075</FONT>        }<a name="line.75"></a>
<FONT color="green">076</FONT>        <a name="line.76"></a>
<FONT color="green">077</FONT>        /**<a name="line.77"></a>
<FONT color="green">078</FONT>         * &lt;p&gt;Returns a pseudorandom, uniformly distributed int value<a name="line.78"></a>
<FONT color="green">079</FONT>         * between &lt;code&gt;0&lt;/code&gt; (inclusive) and the specified value<a name="line.79"></a>
<FONT color="green">080</FONT>         * (exclusive), from the given Random sequence.&lt;/p&gt;<a name="line.80"></a>
<FONT color="green">081</FONT>         *<a name="line.81"></a>
<FONT color="green">082</FONT>         * @param random the Random sequence generator.<a name="line.82"></a>
<FONT color="green">083</FONT>         * @param n  the specified exclusive max-value<a name="line.83"></a>
<FONT color="green">084</FONT>         * @return the random int<a name="line.84"></a>
<FONT color="green">085</FONT>         */<a name="line.85"></a>
<FONT color="green">086</FONT>        public static int nextInt(Random random, int n) {<a name="line.86"></a>
<FONT color="green">087</FONT>            // check this cannot return 'n'<a name="line.87"></a>
<FONT color="green">088</FONT>            return random.nextInt(n);<a name="line.88"></a>
<FONT color="green">089</FONT>        }<a name="line.89"></a>
<FONT color="green">090</FONT>        <a name="line.90"></a>
<FONT color="green">091</FONT>        /**<a name="line.91"></a>
<FONT color="green">092</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed long value<a name="line.92"></a>
<FONT color="green">093</FONT>         * from the Math.random() sequence.&lt;/p&gt;<a name="line.93"></a>
<FONT color="green">094</FONT>         * &lt;b&gt;N.B. All values are &gt;= 0.&lt;b&gt;<a name="line.94"></a>
<FONT color="green">095</FONT>         * @return the random long<a name="line.95"></a>
<FONT color="green">096</FONT>         */<a name="line.96"></a>
<FONT color="green">097</FONT>        public static long nextLong() {<a name="line.97"></a>
<FONT color="green">098</FONT>            return nextLong(JVM_RANDOM);<a name="line.98"></a>
<FONT color="green">099</FONT>        }<a name="line.99"></a>
<FONT color="green">100</FONT>    <a name="line.100"></a>
<FONT color="green">101</FONT>        /**<a name="line.101"></a>
<FONT color="green">102</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed long value<a name="line.102"></a>
<FONT color="green">103</FONT>         * from the given Random sequence.&lt;/p&gt;<a name="line.103"></a>
<FONT color="green">104</FONT>         *<a name="line.104"></a>
<FONT color="green">105</FONT>         * @param random the Random sequence generator.<a name="line.105"></a>
<FONT color="green">106</FONT>         * @return the random long<a name="line.106"></a>
<FONT color="green">107</FONT>         */<a name="line.107"></a>
<FONT color="green">108</FONT>        public static long nextLong(Random random) {<a name="line.108"></a>
<FONT color="green">109</FONT>            return random.nextLong();<a name="line.109"></a>
<FONT color="green">110</FONT>        }<a name="line.110"></a>
<FONT color="green">111</FONT>        <a name="line.111"></a>
<FONT color="green">112</FONT>        /**<a name="line.112"></a>
<FONT color="green">113</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed boolean value<a name="line.113"></a>
<FONT color="green">114</FONT>         * from the Math.random() sequence.&lt;/p&gt;<a name="line.114"></a>
<FONT color="green">115</FONT>         *<a name="line.115"></a>
<FONT color="green">116</FONT>         * @return the random boolean<a name="line.116"></a>
<FONT color="green">117</FONT>         */<a name="line.117"></a>
<FONT color="green">118</FONT>        public static boolean nextBoolean() {<a name="line.118"></a>
<FONT color="green">119</FONT>            return nextBoolean(JVM_RANDOM);<a name="line.119"></a>
<FONT color="green">120</FONT>        }<a name="line.120"></a>
<FONT color="green">121</FONT>    <a name="line.121"></a>
<FONT color="green">122</FONT>        /**<a name="line.122"></a>
<FONT color="green">123</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed boolean value<a name="line.123"></a>
<FONT color="green">124</FONT>         * from the given random sequence.&lt;/p&gt;<a name="line.124"></a>
<FONT color="green">125</FONT>         *<a name="line.125"></a>
<FONT color="green">126</FONT>         * @param random the Random sequence generator.<a name="line.126"></a>
<FONT color="green">127</FONT>         * @return the random boolean<a name="line.127"></a>
<FONT color="green">128</FONT>         */<a name="line.128"></a>
<FONT color="green">129</FONT>        public static boolean nextBoolean(Random random) {<a name="line.129"></a>
<FONT color="green">130</FONT>            return random.nextBoolean();<a name="line.130"></a>
<FONT color="green">131</FONT>        }<a name="line.131"></a>
<FONT color="green">132</FONT>        <a name="line.132"></a>
<FONT color="green">133</FONT>        /**<a name="line.133"></a>
<FONT color="green">134</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed float value<a name="line.134"></a>
<FONT color="green">135</FONT>         * between &lt;code&gt;0.0&lt;/code&gt; and &lt;code&gt;1.0&lt;/code&gt; from the Math.random()<a name="line.135"></a>
<FONT color="green">136</FONT>         * sequence.&lt;/p&gt;<a name="line.136"></a>
<FONT color="green">137</FONT>         *<a name="line.137"></a>
<FONT color="green">138</FONT>         * @return the random float<a name="line.138"></a>
<FONT color="green">139</FONT>         */<a name="line.139"></a>
<FONT color="green">140</FONT>        public static float nextFloat() {<a name="line.140"></a>
<FONT color="green">141</FONT>            return nextFloat(JVM_RANDOM);<a name="line.141"></a>
<FONT color="green">142</FONT>        }<a name="line.142"></a>
<FONT color="green">143</FONT>    <a name="line.143"></a>
<FONT color="green">144</FONT>        /**<a name="line.144"></a>
<FONT color="green">145</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed float value<a name="line.145"></a>
<FONT color="green">146</FONT>         * between &lt;code&gt;0.0&lt;/code&gt; and &lt;code&gt;1.0&lt;/code&gt; from the given Random<a name="line.146"></a>
<FONT color="green">147</FONT>         * sequence.&lt;/p&gt;<a name="line.147"></a>
<FONT color="green">148</FONT>         *<a name="line.148"></a>
<FONT color="green">149</FONT>         * @param random the Random sequence generator.<a name="line.149"></a>
<FONT color="green">150</FONT>         * @return the random float<a name="line.150"></a>
<FONT color="green">151</FONT>         */<a name="line.151"></a>
<FONT color="green">152</FONT>        public static float nextFloat(Random random) {<a name="line.152"></a>
<FONT color="green">153</FONT>            return random.nextFloat();<a name="line.153"></a>
<FONT color="green">154</FONT>        }<a name="line.154"></a>
<FONT color="green">155</FONT>        <a name="line.155"></a>
<FONT color="green">156</FONT>        /**<a name="line.156"></a>
<FONT color="green">157</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed float value<a name="line.157"></a>
<FONT color="green">158</FONT>         * between &lt;code&gt;0.0&lt;/code&gt; and &lt;code&gt;1.0&lt;/code&gt; from the Math.random()<a name="line.158"></a>
<FONT color="green">159</FONT>         * sequence.&lt;/p&gt;<a name="line.159"></a>
<FONT color="green">160</FONT>         *<a name="line.160"></a>
<FONT color="green">161</FONT>         * @return the random double<a name="line.161"></a>
<FONT color="green">162</FONT>         */<a name="line.162"></a>
<FONT color="green">163</FONT>        public static double nextDouble() {<a name="line.163"></a>
<FONT color="green">164</FONT>            return nextDouble(JVM_RANDOM);<a name="line.164"></a>
<FONT color="green">165</FONT>        }<a name="line.165"></a>
<FONT color="green">166</FONT>    <a name="line.166"></a>
<FONT color="green">167</FONT>        /**<a name="line.167"></a>
<FONT color="green">168</FONT>         * &lt;p&gt;Returns the next pseudorandom, uniformly distributed float value<a name="line.168"></a>
<FONT color="green">169</FONT>         * between &lt;code&gt;0.0&lt;/code&gt; and &lt;code&gt;1.0&lt;/code&gt; from the given Random<a name="line.169"></a>
<FONT color="green">170</FONT>         * sequence.&lt;/p&gt;<a name="line.170"></a>
<FONT color="green">171</FONT>         *<a name="line.171"></a>
<FONT color="green">172</FONT>         * @param random the Random sequence generator.<a name="line.172"></a>
<FONT color="green">173</FONT>         * @return the random double<a name="line.173"></a>
<FONT color="green">174</FONT>         */<a name="line.174"></a>
<FONT color="green">175</FONT>        public static double nextDouble(Random random) {<a name="line.175"></a>
<FONT color="green">176</FONT>            return random.nextDouble();<a name="line.176"></a>
<FONT color="green">177</FONT>        }<a name="line.177"></a>
<FONT color="green">178</FONT>        <a name="line.178"></a>
<FONT color="green">179</FONT>    }<a name="line.179"></a>




























































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